fix GenericStack.pop() and modify toString() #45
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1. Call list[size] should return null (if list[size-1] is the last element of the stack), this does not happen because the pop() method does not actually eliminate any element. 2. When pop() is called, size should never be left with a negative value.
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Call
list[size]should returnnull(iflist[size-1]is the last element of the stack), this does not happen because thepop()method does not actually eliminate any element.When
pop()is called,sizeshould never be left with a negative value.